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Preparation method of CHDI-modified NDI-based polyurethane microcellular elastomer

A microporous elastomer and polyurethane technology, applied in the field of materials, can solve problems such as shortened service life, increased complexity of the reaction system, performance impact, etc., and achieve the goals of prolonging service life, improving photooxidation resistance, and improving wear resistance Effect

Active Publication Date: 2017-08-01
上海凯众聚氨酯有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the above two technical schemes all use aromatic isocyanate as a raw material, the nitrogen atom adjacent to the benzene ring forms a large ∏ bond conjugated system, which is easily damaged under the action of light (especially ultraviolet light), heat and oxygen The photooxidation reaction occurs, which destroys the main chain structure of the macromolecule, resulting in a greatly shortened service life of the material
Technologists often solve this technical shortcoming by adding anti-ultraviolet agents and antioxidants. However, anti-ultraviolet agents and antioxidants can only delay this photooxidation reaction to a certain extent, and the addition of both will increase the overall reaction system. The degree of complexity also has a certain impact on the performance of the final product

Method used

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  • Preparation method of CHDI-modified NDI-based polyurethane microcellular elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The specific method for preparing CHDI-modified NDI-based polyurethane microcellular elastomer in this embodiment is:

[0020] Mix 5 moles of NDI and 1 mole of CHDI evenly, and react with 2.723 moles of polyethylene adipate diol with a number average molecular weight of 1000 at 128°C for 25 minutes to obtain a terminal-NCO group content of 7wt%. terminal isocyanate prepolymer.

[0021] 100 mass parts of polyethylene adipate glycol with a number average molecular weight of 1000 and 10 mass parts of 1,4-butanediol, 6 mass parts of water, 0.8 mass parts of delayed catalyst (Dabco 1027), 0.8 parts by mass of a foam stabilizer (DabcoDC 2585) were mixed uniformly to prepare a chain extender composition.

[0022] Using a low-pressure foaming machine, the prepolymer and the chain extender composition are mixed and reacted according to the ratio of the isocyanate index of 95%, and the reaction liquid is injected into a mold at 90°C, aged for 25 minutes, demoulded, and then heat...

Embodiment 2

[0028] The specific method for preparing CHDI-modified NDI-based polyurethane microcellular elastomer in this embodiment is:

[0029] Mix 4 moles of NDI and 1 mole of CHDI evenly, and react with 1.765 moles of polycaprolactone diol with a number-average molecular weight of 2000 at 129° C. for 25 minutes to obtain a terminal isocyanate preprepared with a terminal-NCO group content of 6 wt%. Polymer.

[0030] 100 mass parts of polycaprolactone diol with a number average molecular weight of 2000 and 10 mass parts of 1,4-butanediol, 8 mass parts of water, 0.8 mass parts of retardation catalyst (Dabco 1027), 0.8 Mass parts of the foam stabilizer (Dabco DC 2585) were mixed uniformly to prepare a chain extender composition.

[0031] Using a low-pressure foaming machine, the prepolymer and the chain extender composition are mixed and reacted according to the ratio of the isocyanate index of 96%. After aging for 16 hours, a CHDI-modified NDI-based polyurethane microcellular elastomer...

Embodiment 3

[0033] The specific method for preparing CHDI-modified NDI-based polyurethane microcellular elastomer in this embodiment is:

[0034] Mix 4 moles of NDI and 1 mole of CHDI evenly, and react with 2.011 moles of polytetrahydrofuran ether diol with a number-average molecular weight of 2000 at 128°C for 25 minutes to prepare an isocyanate-terminated prepolymer with a terminal-NCO group content of 5 wt%. .

[0035] 100 parts by mass of polytetrahydrofuran ether glycol with a number average molecular weight of 2000, 10 parts by mass of 1,4-butanediol, water of 9 parts by mass, retardation catalyst (Dabco 1027) of 0.8 parts by mass, 0.8 parts by mass The foam stabilizer (Dabco DC2585) was mixed uniformly to prepare the chain extender composition.

[0036] Using a low-pressure foaming machine, the prepolymer and the chain extender composition are mixed and reacted according to the ratio of the isocyanate index to 96%. After aging for 16 hours, a CHDI-modified NDI-based polyurethane ...

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Abstract

The invention discloses a preparation method of CHDI-modified NDI-based polyurethane microcellular elastomer. The preparation method comprises the following steps: 1) reacting excessive NDI and CHDI with high-molecular-weight diol with the number-average molecular weight of 1000-3000 at 125-130 DEG C to form a prepolymer having a terminal isocyanate group content of 4-7 wt%; 2) mixing high-molecular-weight diol with small-molecular-weight diol with the molecular weight of 48-200, a foaming agent, a delayed catalyst, and a foam stabilizer to prepare a chain extender composition; 3) mixing the prepolymer with the chain extender composition at an isocyanate index ratio of 95-105%, and injecting the obtained product to a die at 80-100 DEG C for casting moulding; and 4) performing curing, demoulding and post-curing. According to the method, CHDI insensitive to a photooxidation reaction is introduced, and on the basis of keeping excellent dynamic fatigue resistance of NDI-based polyurethane microcellular elastomer, the photooxidation resistance of the elastormer is improved, the wear resistance of the elastormer is improved, and the service life of the elastormer is prolonged.

Description

technical field [0001] The present invention relates to the field of materials, in particular to polyurethane microcellular elastomers, more specifically, to a CHDI (1,4-cyclohexane diisocyanate) modified NDI (1,5'-naphthalene diisocyanate) Preparation method of base polyurethane microcellular elastomer. Background technique [0002] Polyurethane microcellular elastomer is a chemical system formed by pouring a liquid reaction mixture into a mold cavity. The chemical raw materials used mainly include isocyanate, polyol, chain extender, foaming agent, catalyst, foam equalizer, etc.; in the preparation process It mainly includes the following chemical reactions: polyol reacts with isocyanate to form a gel reaction of carbamate, and isocyanate reacts with water to form urea and CO 2 foaming reaction. The wear resistance of polyurethane elastomer is very outstanding, which is about 3 to 5 times that of natural rubber, and it also has excellent shock absorption and buffer perfor...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/75C08G18/66C08G18/10C08J9/08
CPCC08G18/10C08G18/724C08G18/751C08G18/7678C08G2110/0083C08G18/664C08G18/6674C08G18/6607
Inventor 杨亚军李明英闫贺佳范春晓
Owner 上海凯众聚氨酯有限公司
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